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Live rendering merged reasoning chunks by scanning backward to the latest assistant row. That fixed late reasoning, but the scan skipped trace rows, so reasoning after a tool call crossed the Used tools block and attached to the previous assistant iteration. Refresh looked correct because persisted history reconstructs assistant/tool boundaries. Treat trace rows as hard phase boundaries, just like user messages. A reasoning_delta after Used tools now starts a fresh assistant placeholder, so live rendering matches replay: Thinking -> Used tools -> Thinking -> Used tools / answer. Add a regression for reasoning_delta -> reasoning_end -> tool_hint -> reasoning_delta. Co-authored-by: Cursor <cursoragent@cursor.com>